<template>
	<view class="u-wrap">
		<u-navbar :is-back="false" :background="background">
			<view class="slot-wrap u-flex-1" style="padding: 0 10px">
				<u-search placeholder="直接搜索商品" v-model="search" :show-action="false" :height="54" bg-color="#ffffff" style="width: 100%"
				 :animation="true" :clearabled="true" @search="jumpSearch(search)"></u-search>
			</view>
		</u-navbar>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view v-for="(item, index) in tabbar" :key="index" class="u-tab-item" :class="[
            current == index
              ? 'u-tab-item-active'
              : current == index - 1
              ? 'u-tab-item-after'
              : current == index + 1
              ? 'u-tab-item-before'
              : '',
          ]"
				 :data-current="index" @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{ item.name }}</text>
				</view>
			</scroll-view>
			<block>
				<scroll-view scroll-y class="right-box">
					<view style="
              width: 100%;
              height: auto;
              background-color: #ffffff;
              padding: 10px 20px;
            ">
						<view v-for="(item, index) in classDetail" :key="index">
							<text style="font-weight: 800">{{ item.show_name }}</text>
							<view class="class-item">
								<view class="item-container">
									<view class="thumb-box" v-for="(item1, index1) in item.class" :key="index1" @click="jumpSearch(item1.searchname)">
										<image class="item-menu-image" :src="item1.url" mode=""></image>
										<view class="item-menu-name">{{ item1.keyword }}</view>
									</view>
								</view>
							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
		<u-modal v-model="islogin" content="您还未登录,登录后方可正常使用" :show-cancel-button="true" confirm-text="去登陆" confirm-color="#E76E4D"
		 @confirm="jumpLogin()"></u-modal>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				tabbar: [],
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
				classId: 0,
				classDetail: [],
				search: "",
				background: {
					backgroundColor: "rgb(248,248,249)"
				},
				islogin: false,
			};
		},
		onLoad() {
			this.getClassList();
		},
		onShow() {
			this.islogin = uni.getStorageSync("token") ? false : true;
			console.log(this.islogin)
		},
		methods: {
			jumpLogin(){
				uni.switchTab({
					url: '/pages/my/index'
				});
			},
			jumpSearch(keyword) {
				if (keyword == false) return;
				uni.navigateTo({
					url: "/pages/index/search/search?problem=" + keyword,
				});
			},
			getClassList() {
				this.$u.api
					.getCateClassList()
					.then((res) => {
						console.log(res);
						this.tabbar = res.data.content;
						this.classId = res.data.content[0].id;
						this.getClassDetail(this.classId);
					})
					.catch((err) => {
						console.log(err);
					});
			},
			getClassDetail(id) {
				this.$u.api
					.getCateClassDetail({
						class_id: id,
					})
					.then((res) => {
						this.classDetail = res.data;
						console.log(this.classDetail);
					})
					.catch((err) => {
						console.log(err);
					});
			},
			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if (index == this.current) return;
				this.classId = this.tabbar[index].id;
				this.getClassDetail(this.classId);
				this.current = index;
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect("menu-scroll-view", "menuHeight");
					await this.getElRect("u-tab-item", "menuItemHeight");
				}
				// 将菜单菜单活动item垂直居中
				this.scrollTop =
					index * this.menuItemHeight +
					this.menuItemHeight / 2 -
					this.menuHeight / 2;
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query
						.select("." + elClass)
						.fields({
								size: true,
							},
							(res) => {
								// 如果节点尚未生成，res值为null，循环调用执行
								if (!res) {
									setTimeout(() => {
										this.getElRect(elClass);
									}, 10);
									return;
								}
								this[dataVal] = res.height;
							}
						)
						.exec();
				});
			},
		},
	};
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
		background-color: #ffffff;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}

	.u-tab-item-before {
		border-bottom-right-radius: 10px !important;
	}

	.u-tab-item-after {
		border-top-right-radius: 10px !important;
	}

	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}

	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		color: $u-main-color;
	}

	.item-container {
		display: flex;
		flex-wrap: wrap;
	}

	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}

	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
</style>
